Fluid motor device



April 3, 1934. v. M. EVERETT FLUID MOTOR DEVICE Filed July 1, 1933 2Sheets-Sheet l a w a w w w a /M%%/ I 6 W Filed July 1, 1953 2Sheets-Sheet 2 [/v vavroa [/2 man M [ft e r67;

ATTOQNEK Patented Apr. 3, i934 1,953,534 FLUID MOTOR DEVICE Vernon M.Everett, Fullerton, Calif. Application July 1,1933, Serial No. 678,59014 Claims. (01.121-3) My invention relates to a fluid motor, and relatesin particular to the construction of small fluid motors of portablecharacter adapted for reciprocation of a tool or working member movablysecured to the portable motor structure.

It is found that there are certain mechanical operations which can beperformed only by reciprocating motion of a tool or working part. Forexample, the filing of dies requires the use of a file in reciprocatingmotion. Until lately work of this character has been done manually, butnow filing machines are employed, in which the file is reciprocatedthrough a hole in a table, and the die to be filed is moved on thistable relative to the file, which operates in a fixed position. Myinvention provides a relatively light fluid motor to which a tool, suchas a file, may be secured, this motor being of such compact size andlight weight that it may be moved by a workman relative to the object tobe filed, thereby greatly expediting the filing operation. As a furtherexample, it is found that polishing, rubbing, and sanding operations arebest performed with a reciprocating motion, rather than with a circularmotion, and in the absence of suitable mechanical devices adapted to bemoved relative to the surface of the work to be polished, a great dealof such work is now done by hand. My present invention is especiallyadapted for use as a mechanical polishing or rubbing device, adapted tohold a suitable rubbing pad, sheet of abrasive material, etc., andadapted to be manually moved across the surface of the work. As apolishing device, my invention is of especial value for the reason thatit efficiently produces a high frequency reciprocation of a polishing orrubbing pad, thereby minimizing the time and the human effort requiredfor a given job.

It is an object of my invention to provide a' simple form of fluid motorhaving a reciprocating piston of double-end character adapted to operatein a cylinder bore, the device having a simple valve means forcontrolling the flow of fluid under pressure to the ends of the pistonmember, and for transmitting reciprocating motion from the piston to theworking member of the device.

It is an object of the invention to provide a device of the abovecharacter in which the piston bore, valve bore, and fluid passages areformed from end to end of a body by simple boring and reamingoperations, and having end plates which are fitted upon the end of thebody so as to close these passages.

It is a further object of the invention to provide a device of the abovecharacter having a simple and rugged construction, in which connectionto the reciprocating piston member is made through openings in thecenter of the body containing the cylinder bore in which the pistonoperates, it being a further feature of this invention to provide asimple means for controlling the extremes of movement of the pistonmember and for producing an essentially harmonic movement of the piston.member, whereby a pounding action of the operating parts of the deviceis reduced to a minimum. I It is a further object of my invention toprovide a motivating device of the above character having a fly-wheeltherein for minimizing vibration by counterbalancing the movement of thereciprocating parts. An especial feature of this device is that afly-wheel is employed which operates at sufliciently high speed toprovide a stabilizing effect through use of gyroscopic action of theflywheel so that a smooth manipulation of the device over the surfacebeing treated is attained.

Further objects and advantages of the invention will be made evidentthroughout the following part of the specification.

Referring to the drawings, which are for illustrative purposes only, v

Fig. 1 is a side view of a preferred embodiment of my invention, thisview being partly sectioned on a central vertical plane.

Fig. 2 is a longitudinal section on a plane represented by the line 22of Fig. 1.

Fig. 3 is a cross section on a plane represented by the line 3--3 ofFig. 1.

Fig. 4 is a cross section on by the line 4-4 of Fig. 1.

Fig. 5 is a horizontal section on a. plane represented by the line 55 ofFig. 3.

Fig. 6 is a fragmentary section taken as indicated by the line 6-6 ofFig. 5.

a plane represented Fig. 7 is a fragmentary horizontally sectioned viewshowing an alternative manner of forming the valve ports at the ends ofthe cylinder bore of the device.

As shown in Figs. 1, 3, 4, and 5 of the drawings, the invention employsa body 10 of essentially rectangular prismoidal form, an arched covermember 11 which is of the same length as the body 10 and is placed so asto cover the upper facethereof, and end plates 12 and 13 of such size asto extend over the ends of the body 10 and the cover member 11, the endplates being secured to such members by the means of screws 14. As bestshown in Fig. 5, a cylinder bore 15, a valve bore 16, and a fluiddelivery passage 17 may be formed longitudinally through the body 10from the front end face 18 thereof to the rear end face 19 thereof.Extending upwardly from an intermediate part of the cylinder bore 15 isa first opening 21, and extending downwardly from the bore 15 inalignment with the opening 21 is a second opening 22. As shown in Fig.4, a longitudinally elongated opening 23 extends upwardly from a pointnear the forward end of the valve bore 16, this opening 23 providing aspace in which a valve operating pin 24 may move andalso a dischargepassage leading outwardly from an intermediate part of the valve bore16. It is to be noted that since the bores 15 and 16 extend from end toend of the body 10, they may be readily formed and reamed.

Within the bore 15 is a piston member 25 having cylindrical ends 26 and27 to which sealing means are secured, such sealing means being shown ascup washers 28 held in place by screws 29 and filler washers 30. Afterplacing the piston 25 in the cylinder bore 15, a pin or bar 32 isthreaded through an opening 33 formed preferably centrally in the piston25, the upper end of the bar 32 providing a pin or projection 34 and itslower end 35 constituting a movement of power transmitting meansprojecting downwardly through the opening 22 so as to engage a bushing36 which is secured by means of screws 37 to the lower plate portion 38of a flexible rubbing pad or working member 40 which has rubber walls 41extending upwardly from the lower wall 38 and connecting to a horizontalupper wall 42, preferably of rubber, which is adapted to be secured tothe lower face of the body 10 by means of studs 43, as shown in Fig. 3.

Extending rightwardly from the upper opening 21, a slot or channel 45 isformed in the upper face of the body 10, this channel 45 receiving aslide bar 46 which is held in the channel 45 by means of a plate 49 andscrews 49a, and the leftward end of which slide bar 45 extends into theupper part of the opening 21 and has an opening 47 therein for receivingthe upwardlyextending pin portion 34 by which the reciprocating movementof the piston 25 is transmitted to the bar 46. A pin 48 extends upwardlyfrom the rightward end of the bar 46, this pin 48 constituting a wristpin to which a connecting rod 50 is attached. The connecting rod 50 hasa bushing 51 mounted in its rightward end, such bushing 51 fitting downover the pin 48 and resting against the upper face of the bar 46,thereby holding the connecting rod 50 in raised position relative to thebar 46. The leftward end of the connecting rod 50 has a ball bearing 52mounted therein for engagement with a crank pin 53 connected to afiy-wheel 54. The upper face of the fly-wheel 54 is provided with atrunnion 55 adapted to engage a ball bearing 56 mounted in the upperwall of the cover member 11. The crank pin 53 extends downwardly fromthe fly-wheel 54 and has an eccentric 57 mounted on its lower end, thiseccentric in turn having a downwardly projecting trunnion 58 which isconcentric with the trunnion 55 of the fly-wheel 54. The leftwardportion of the upper face of the body 10 is counterbored at 60 toreceive a ball bearing. 61 for carrying the trunnion 58 in alignmentwith the trunnion 55. The diameter of the circle on which the crank pin53 rotates determines the distance through whichthe bar 50 and thepiston 25 may move; accordingly, the extremes of movement of the piston25-are determined by the flywheel structure, and the movement of thepiston 25 is likewise given a harmonic character. As

will be noted in Fig. 1, the eccentric 57 is mounted close to the upperface of the body 10, and on the upper face of the body 10, as shown alsoin Figs. 2 and 4, a yoke member 62 is pivotally secured by means of ascrew 63. The yoke member 62 has a laterally elongated opening 64 whichreceives the eccentric 57, and the swinging end 65 of the yoke 62carries the valve operating pin 24 described hereinabove relative toFig. 4. As the fly-wheel 54 and the eccentric 57 rotate, the yoke member62 is swung back and forth so as to move the pin 24 longitudinally inthe elongated opening 23 which extends upwardly from an intermediateportion ofthe valve bore 16.

Mounted in the valve bore 16 is a valve member 66 consisting of a stemor bar 67 of smaller diameter than the valve bore 16 and havingcylindrical valve heads 68 and 70 secured to the ends thereof. The valveheads 68 and 70 are of essentially the same diameter as the valve bore16, and may eachconsist of a ring 71 of triangular cross section held onan end of the stem 67 between a washer 72 and the head 73 of a screw'74.

In alignment with the ends of the valve bore 16, counterbores oropenings 75 are formed in the end plates 12 and 13, these counterbores75 having cylindrical bushings 76 and 77 mounted therein so as toproject slightly from the faces of the end plates 12 and 13. Thebushings 76 and 77 have the same internal diameter as the valve bore 16,and the ends thereof project into shallow counterbores 78 formed at theends of the valve bore 16 in such a manner that the bushings 76 and 77will be concentrically aligned with the valve bore 16 and will formextensions of the valve bore beyond the ends of the cylinder bore 15. Ablind opening 80 is formed in the end plate 12 in alignment with thefluid delivery passage 17, and by means of an undercutting drilling toola-passage 81 may be formed connecting the blind end of the opening 80with the extreme end of the valve bore 16 identified by the bushing 76.In a similar manner, an opening 82 is formed in the end plate 13, andthis opening 82 is connected with the interior of the bushing 77 bymeans of a passage 83. Fluid ports 84 and connect the ends of thecylinder bore 15 with the valve bore 16 at the inner ends of thebushings 76 and 77. The valve member 66 is of such length that when theValve head 68 is within the bushing 76, the valve head 70 will bewithdrawn from the bushing 77 and will be disposed to the left of thevalve port 85. In the position of the valve member 66 shown in Fig. 5,the rightward end of the cylinder bore 15 will connect through the port85 and the interior of the bushing 77 with the passage 83 connectingwith the fluid delivery passage 17, and the leftward end of the cylinderbore 15 will connect through the port 84 directly with the intermediateportion of the valve bore 16 and will be shut off from communicationwith the fluid delivery passage 17 by reason of the fact that the valvehead 68 is in a position within the bushings 76 and 77 and lies to theleft of the port 84. It will be perceived that the ports 84 and 85 maybe conveniently formed by cutting grooves in the ends of the body 10 inpositions to connect between the end portions of the bores 15 and 16,this constituting one of the many structural simplifications which mypresent invention provides.

In alignment with the opening 23, the valve stem 67 may have a sleeve orbushing 87 mounted thereon, the upper part of this member 87 having anopening 88 adapted to receive the lower end of the valve operating pin24. Accordingly,

as the rotation of the eccentric 57 produces oscil- 153 cates, themovement thereof lation of the yoke 62, engagement of the lower end ofthe pin 24 with the opening 88 will cause a corresponding movement ofthe-valve member 66 so that the valve heads 68 and '70 will be moved intimed relation to the operation of the piston, whereby to control theflow of fluid to and from the respective ends of the cylinder bore 15.One of the end plates, such as the end plate 13, may have a handle 90formed thereon, and adjacent the lower portion of the handle 90 metalbodies 91 and 92 may be formed, the outer ends of these bodies 91 and 92having means 93 and 94 thereon for the connection thereto of hosemembers 95 and 96. The body 91 is provided with a fluid passage 97having a valve device 98 for the control thereof, and the body 92 isprovided with a passage 100 which has a valve device 101 and connectswith a cross passage 102, through which passage 102 water may beconducted to passages 103 which extend to the face of the end plate 13in position to communicate with water delivery passages 104 formedwithin and along the sides of the body 10. Accordingly, the hose 96 maybe employed to deliver water to the device when it is being used for wetsanding or wet rubbing of a surface to be finished, this water beingdelivered to the surface which is being operated on through small jetopenings 105 which lead outwardly from the passages 104 in the body 10.

The form of the invention shown in the drawings is especially adaptedfor use of compressed air as a motivating fluid, which air is deliveredto the device through the hose 95. When the cooperating parts of thedevice are in the positions shown in Figs. 1, 2, and 3, the rightwardend of the cylinder bore 15,.will be connected with the fluid passage17, and the leftward end of the cylinder bore 15 will be connectedthrough the port 84 with the discharge passage formed by a portion ofthe intermediate part of the valve bore 16, the opening 23, the interiorof the cover member 11, and a passage 107 which leads rightwardly anddownwardly through the central portion of the handle structure. Ifdesired, the outer end 108 of the discharge passage may be connectedwith a discharge hose 109, this; however, being a matter of preferenceof the user of the device. When the piston 25 is moved leftwardly to theother end of the bore 15, the valve member 66 will be moved rightwardlyso that the valve head '70 will lie within the bushing '77, and thevalve head 68 will be disposed to the right of the valve port 84.Therefore, the delivery to and discharge from the cylinder bore 15 willbe reversed so that the leftward end of the bore 15 will be'connectedwith the fluid delivery passage 1'7, and the rightward end of the bore15 will be connected with the discharge passage formed through theintermediate portion of the valve bore 16, as previously described.

The structure herein shown is extremely simple and is very durable. Asthe piston 25 reciprois' transmitted through the member 35 to the lowerwall 38 which is flexibly or movably connected through the walls 41 withthe wall 42 connected directly to the lower face of the fluid motordevice. The movement of the lower wall 38, which may have suitable clothor other rubbing fabric secured thereto, is accompanied by a flexing ofthe upright walls 41 between the extreme positions and intermediatepositions indicated by full and dotted lines in Fig. 1. The fly-wheel 54and its associated controlling parts are disposed within the covermember 11 so as to be fully protected. The body 10 be readily gripped bythe hand of the operator not engaging the handle 90. For example, theside walls of the body 10 are converged upwardly as indicated at 110 inFig. 3, and the cover member has the side walls thereof rounded at 111and then curved inwardly at 112 to meet the side walls of the body 10.

The interior faces of the bushings 76 and '77 constitute extensions ofthe valve bore 16. In the form of the invention disclosed in Figs. 1 to6, the bushings 76 and 77 are aligned with the valve bore 16 by reasonof the fact that they project into shallow counterbores '78 formed atthe ends of the bore 16. It will be perceived that these bushings '76and 77 may be eliminated, but that the elimination thereof would requireadditional machine operations in aligning the openings formed in the endplates 12 and 13 with the valve bore 16. In Fig. 7 I show a simple meanswhereby the use of the bushings 76 and 77 may be avoided. In thisalternative structure the end plates, such as the end plate 13, areprovided with a cylindrical boss 120 which extends within the extremityof the cylinder bore 15 so as to act as a. filler for the end of thebore 15 beyond a valve port 121 which is cut by means of a milling toolthrough the metal wall 122 of the body 10 disposed between the bores 15and 16. It will be seen, therefore, that the valve bore 16 has an endportion 123 disposed beyond or rightwardly of the port 121, therebyproviding a space into which the valve head 70 may move from theposition in which it is shown in Fig. '7. For connecting the extreme endof the valve bore 16 with the fluid delivery passage 17, a slot 124 iscut in the end face of the body 10 as shown. When the valve head ,70 isin the position shown in Fig. 7, there will be a direct communicationbetween the fluid delivery passage 1'7 and the rightward end of thecylinder bore 15. When the valve head 70 moves rightwardly into the endspace 123 of the valve bore 16, the port 121 will connect with theintermediate portion of the valve bore 16, which intermediate portionforms a part of the discharge passage of the device.

Although I have herein shown and described my invention in simple andpractical form, it is recognized that certain parts or elements thereofare representative of other parts, elements, or mechanisms which may beused in substantially the same manner to accomplish substantially thesame results; therefore, it is to be understood that the invention isnot to be limited to the details disclosed herein but is to be accordedthe full scope of the following claims.

I claim as my invention:

1. A device of the character described, includ-- ing:. a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being a lateral opening from anintermediate portion of said cylinder bore to the exterior of said body,there being ports connecting the ends of said cylinder bore with saidvalve bore at points a short distance within the ends of said valvebore, and there being also a fluid discharge passage extending outwardlyfrom an intermediate portion of said valve bore; a double-ended pistonin said cylinder bore, said piston being shorter than said cylinder boreso as to reciprocate therein; a valve stem extending longitudinallywithin said valve bore; a valve head connected to each end of said valvestem, each of said heads being adapted to be moved between positionsbeyond and within the said port associated therewith while the other ofsaid heads is moved by said stem between positions within and beyond thesaid port at the opposite end of said valve bore, so that when one ofsaid heads is in a position to connect an end of said cylinder bore withthe corresponding end of said valve bore, the other of said heads willbe in a position to connect the opposite end of said cylinder borethrough the intermediate portion of said valve bore with said fluiddischarge passage; valve operating means connecting with said valve stemso as to move the same back and forth in timed relation to the movementof said piston; and actuating means for said valve operating meansconnecting through said lateral opening with an intermediate portion ofsaid piston.

2. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being first and second lateral openingsextending in opposite directions from an intermediate portion of saidcylinder bore to the exterior of said body, there being ports connectingthe ends of said cylinder bore with said valve bore at points a shortdistance within the ends of said valve bore, and there being also afluid discharge passage extending outwardly from an intermediate portionof said valve bore; a double-ended piston in said cylinder bore, saidpiston being shorter than said cylinder bore so as to reciprocatetherein; a valve stem extending longitudinally within said valve bore; avalve head connected to each end of said valve stem, each of said headsbeing adapted to be moved between positions beyond and within the saidport associated therewith while the other of said heads is moved by saidstem between positions within and beyond the said port at the oppositeend of said valve bore, so that when one of said heads is in a positionto connect an end of said cylinder bore with the corresponding end ofsaid valve bore, the other of said heads will be in a position toconnect the opposite end of said cylinder bore through the intermediate'portion of said valve bore with said fluid discharge passage; valveoperating means connecting with said valve stem so as to move the sameback and forth in timed relation to the movement of said piston;actuating means for said valve operating means connecting through thefirst of said lateral openings with an intermediate portion of saidpiston; and power transmitting means extending from an intermediateportion of said piston through said second lateral opening.

3. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being first and second lateral openingsextending in opposite directions from an intermediate portion of saidcylinder bore to the exterior of said body, there being ports connectingthe ends of said cylinder bore with said valve bore at points a shortdistance within the ends of said valve bore, and there being also afluid discharge passage extending outwardly from an intermediate portionof said valve bore; a double-ended piston in said cylinder bore, saidpiston being shorter than said cylinder bore so as to reciprocatetherein; a valve stem extending longitudinally within said valve bore; avalve head connected to each end of said valve stem, each of said headsbeing adapted to be moved between positions beyond and within the saidport associated therewith while the other of said heads is moved by saidstem between positions within and beyond the said port at the oppositeend of said valve bore, so that when one of said heads is in a positionto connect an end of said cylinder bore with the corresponding end ofsaid valve bore, the other of said heads will be in a position toconnect the opposite end of said cylinder bore through the intermediateportion of said valve bore with said fluid discharge passage; valveoperating means connecting with said valve stem so as to move the sameback and forth in timed relation to the movement of said piston;actuating means for said valve operating means connecting through thefirst of said lateral openings with an intermediate portion of saidpiston; power transmitting means extending from an intermediate portionof said piston through said second lateral opening; and a working memberreciprocably mounted on said body and operatively connected to saidpower tramsmitting means.

4. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being first and second lateral openingsextending in opposite directions from an intermediate portion of saidcylinder bore to the exterior of said body, there being ports connectingthe ends of said cylinder bore with said valve bore at points a shortdistance within the ends of said valve bore, and there being also afluid discharge passage extending outwardly from an intermediate portionof said valve bore;

a double-ended piston in said cylinder bore, said piston being shorterthan said cylinder bore so as to reciprocate therein; a valve stemextending longitudinally within said valve bore; a valve head connectedto each end of said valve stem, each of said heads being adapted to bemoved between positions beyond and within the said port associatedtherewith while the other of said heads is moved by said stem betweenpositions within and beyond the said port at the opposite end of saidvalve bore, so that when one of said heads is in a position to connectan end of said cylinder bore with the corresponding end of said valvebore, the other of said heads will be in a position to connect theopposite end of said cylinder bore through the intermediate portion ofsaid valve bore with said fluid discharge passage; valve operating meansconnecting with said valve stem so as to move the same back and forth intimed relation to the movement of said piston; a bar longitudinallyslidable on said body adjacent the outer end of said first lateralopening; means connecting said bar with said piston through said firstlateral opening; actuating means for said valve operat ing meanssupported on the exterior of said body and being connected to said barso as to function in accordance with the back and forth movement of saidbar; and power transmitting means extending from an intermediate portionof said piston through said second lateral opening.

5. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being first and second lateral openingsextending in opposite directions from an intermediate portion of saidcylinder bore to the exterior of said body, there being ports connectingthe ends of said cylinder bore with said valve bore at points a shortdistance within the ends of said valve bore, and there being also afluid discharge passage extending outwardly from an intermediate portionof said valve bore; a double-ended piston in said cylinder bore, saidpiston being shorter than said cylinder bore so as to reciprocatetherein; a valve stem extending longitudinally within said valve bore; avalve head connected to each end of said valve stem. each of saidheadslbeing adapted to be moved between positions beyond and within thesaid port associated therewith while the other of said heads is moved bysaid stem between positions within and beyond the said port at theopposite end of said valve bore, so that when one of said heads is in aposition to connect an end of said cylinder bore with the correspondingend of said valve bore, the other of said heads will be in a position toconnect the opposite end of said cylinder bore through the intermediateportion of said valve bore with said fluid discharge passage; valveoperating means connecting with said valve stem so as to move the sameback and forth in timed relation to the movement of said piston; a bar1ongitudinally slidable on said body adjacent the outer end of saidfirst lateral opening; means connecting said bar with said pistonthrough said first lateral opening; actuating means for said valveoperating means supported on the exterior of said body and beingconnected to said bar so as to function in accordance with the back andforth movement of said bar; power transmitting means extending from anintermediate portion of said piston through said second lateral opening;and a working member reciprocably mounted on said body and operativelyconnected to said power transmitting means.

6. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being first and second lateral openingsextending in opposite directions from an intermediate portion of saidcylinder bore to the exterior of said body, there being ports connectingthe ends of said cylinder bore with said valve bore at points a shortdistance within the ends of said valve bore, and there being also afluid discharge passage extending outwardly from an intermediate portionof said valve bore; a double-ended piston in said cylinder bore, saidpiston being shorter than said cylinder bore so as to reciprocatetherein; a valve stem extending longitudinally within said valve bore; avalve head connected to each end of said valve stem, each of said headsbeing adapted to be moved between positions beyond and within the saidport associated therewith while the other of said heads is moved by saidstern between positions within and beyond the said port at the oppositeend of said valve bore, so that when one of said heads is in a positionto connect an end of said cylinder bore with the corresponding end ofsaid valve bore, the other of said heads will be in a position toconnect the opposite end of said cylinder bore through the intermediateportion of said valve bore with said fluid discharge passage; afly-wheel mounted on said body adjacent the outer end of said firstlateral opening, said fiy-wheel having a crank; valve operating meansconnecting said fiy-wheel and said valve stem so as to move said 7. Adevice of the character described, including: a body having alongitudinal cylinder bore a valve bore, and a fiuid delivery passage,from end to end thereof there being first and second lateral openingsextending in opposite directions from an intermediate portion of saidcylinder bore to the exterior of said body, there being ports connectingthe ends of said cylinder bore with said valve bore at points a shortdistance within the ends of said valve bore, and there being also afluid discharge passage extending outwardly from an intermediate portionof said valve bore; a doubleended piston in said cylinder bore, saidpistombeing shorter than said cylinder bore so as to reciprocatetherein; a valve stem extending longitudinally within said valve bore; avalve head connected to each end of said valve stem, each of said headsbeing adapted to be moved between positions'beyond and within the saidport associated therewith while the other of said heads is moved by saidstem between positions within and beyond the said port at the oppositeend of said valve bore, so that when one of said heads is in a positionto connect an end of said cylinder bore with the corresponding end ofsaid valve bore, the other of said heads will be in a position toconnect the opposite end of said cylinder bore through the intermediateportion of said valve bore with said fluid discharge passage; afly-wheel mounted on said body adjacent the outer end of said firstlateral opening, said fly-wheel having a crank; valve operating meansconnecting said fiy-wheel and said valve stem so as to move said valvestem back and forth in accordance with the movement of said piston; abar slidable on said body adjacent said first lateral opening; meansconnecting said bar with said piston through said first lateral opening;connecting rod means connecting said crank of said fiy-wheel with saidbar, whereby the reciprocation of said bar by said piston will betransmitted to said crank of said flywheel; and power transmitting meansextending from an intermediate portion of said piston through saidsecond lateral opening.

8. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being first and second lateral openingsextending in opposite directions from an intermediate portion of saidcylinder bore to the exterior of said body, there being ports connectingthe ends of said cylinder bore with said valve bore at points a shortdistance within the ends of said valve bore, and there being also afluid discharge passage extending outwardly from an intermediate portionof said valve bore; a double-ended piston in said cylinder bore, saidpiston being shorter than said cylinder bore so as to reciprocatetherein; a valve stem extending longitudinally within said valve bore; avalve head connected to each end of said valve stem, each of said headsbeing adapted to be moved between positions beyond and Within the saidport associated therewith while the other of said heads is moved by saidstem between positions within and beyond the said port at the oppositeend of said valve bore, so that when one of said heads is in a positionto connect an end of said cylinder bore with the corresponding end ofsaid valve bore, the other of said heads will be in a position toconnect the opposite end of said cylinder bore through the intermediateportion of said valve bore with said fluid discharge passage; afly-wheel mounted on said body adjacent the outer end of said firstlateral opening, said fiy-wheel having a crank and a valve operatingeccentric; a yoke member reciprocated by said eccentric; meansconnecting said yoke member with said valve stem so as to move saidvalve stem back and forth in accordance with the movement .of saidpiston; means connecting said crank of said fly-wheel with said piston,through said first lateral opening; and power transmitting meansextending from an intermediate portion of said piston through saidsecond lateral opening.

9. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being first and second lateral openingsextending in opposite directions from an intermediate portion of saidcylinder bore to the exterior of said body, there being ports connectingthe ends of said cylinder bore with said valve bore at points a shortdistance within the ends of said valve bore, and there being also afluid discharge passage extending outwardly from an intermediate portionof said valve bore; a double-ended piston in said cylinder bore, saidpiston being shorter than said cylinder bore so as to reciprocatetherein; a valve stem extending longitudinally within said valve bore; avalve head connected to each end of said valve stem, each of said headsbeing adapted to be moved between positions beyond and within the saidport associated therewith while the other of said heads is moved by saidstem between positions within and beyond the said port at the oppositeend of said vaive bore, so that when one of said heads is in a positionto connect an end of said cylinder bore with the corresponding end ofsaid valve bore, the other of said heads will be in a position toconnect the opposite end of said cylinder bore through the intermediateportion of said valve bore with said fluid discharge passage; afly-wheel mounted on said body adjacent the outer end of said firstlateral opening, said fly-wheel having a crank and a valve operatingeccentric; a yoke member reciprocated by said eccentric; meansconnecting said yoke member with said valve stem so as to move saidvalve stem back and forth in accordance with the movement of saidpiston; a bar slidable on said body adjacent said first lateral opening;means connecting said bar with said piston through said first lateralopening; connecting rod means connecting said crank of said fly-wheelwith said bar, whereby the reciprocation of said bar by said piston willbe transmitted to said crank of said fly-wheel; and power transmittingmeans extending from an intermediate portion of said piston through saidsecond lateral opening.

10. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being first and second lateral openingsextending respectively upwardly and downwardly from an intermediateportion of said cylinder bore to the exterior of said body, there beingports connecting the ends of said cylinder bore with said valve bore atpoints a short distance within the ends of said valve bore, and therebeing also a fluid discharge passage extending outwardly from anintermediate portion of saidvalve bore; a double-ended piston in saidcylinder bore, said piston being shorter than said cylinder bore so asto reciprocate therein; a valve stem extending longitudinally withinsaid valve bore; a valve head connected to each end of said valve stem,each of said heads e g adapted to be moved between positions beyond andwithin the said port associated therewith while the other of said headsis moved by said stem between positions within and beyond the said portat the opposite end of said valve bore, so that when one of said headsis in a position to connect an end of said cylinder bore with thecorresponding end of said valve bore, the other of said heads will be ina position to connect the opposite end of said cylinder bore through theintermediate portion of said valve bore with said fluid dischargepassage; a fly-wheel mounted on said body adjacent the outer end of saidfirst lateral opening, said fiy-wheel having a crank and a valveoperating eccentric; a yoke member reciprocated by said eccentric; meansconnecting said yoke member with said valve stem so as to move saidvalve stem back and forth in accordance with the movement of saidpiston; a bar slidable on said body adjacent said first lateral opening;means connecting said bar with said piston through said first lateralopening; connecting rod means connecting said crank of said fiy-wheelwith said bar, whereby the reciprocation of said bar by said piston willbe transmitted to said crank of said fly-wheel; a hollow cover memberover the top of said body; end plates extending vertically across theends of said body and said cover member, one of said end plates having afluid passage therein connecting with said fluid delivery passage ofsaid body; and power transmitting means extending from an intermediateportion of said piston through said second lateral opening.

11. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being first and second lateral openingsextending respectively upwardly and downwardly from an intermediateportion of said cylinder bore to the exterior of said body, there beingports connecting the ends of said cylinder bore with said valve bore atpoints a short distance within the ends of said valve bore, and therebeing also a fluid discharge passage extending outwardly from anintermediate portion of said valve bore; a double-ended piston in saidcylinder bore, said piston being shorter than said cylinder bore so asto reciprocate therein; a valve stem extending longitudinally withinsaid valve bore; a valve head connected to each end of said valve stem,each of said heads being adapted to be moved between positions'beyondand within the said port associated therewith while the other of saidheads is moved by said stem between positions within and beyond the saidport at the opposite end of said valve bore, so that when one of saidheads is in a position to connect an end of said cylinder bore with thecorresponding end of said valve bore, the other of said heads will be ina position to connect the opposite end of said cylinder bore through theintermediate portion of said valve bore with said fluid dischargepassage; a fly-wheel mounted on said body adjacent the outer end of saidfirst lateral opening, said fiy-wheel having a crank and a valveoperating eccentric; a yoke member reciprocated by said eccentric; meansconnecting said yoke member with said valve stem so as to move saidvalve stem back and forth in accordance with the movement of saidpiston; a bar slidable on said body adjacent said first lateral opening;means connecting said bar with said piston through said first lateralopening; connecting rod means connecting said crank of said fly-wheelwith said bar, whereby the reciprocation of said bar by said piston willbe transmitted to said crank of said fly-wheel; a'

hollow cover member over the top of said body; end plates extendingvertically across the ends of said body and said cover member, one ofsaid end plates having a handle formed thereon and a fluid passagetherein connecting with said fluid delivery passage of said body; andpower transmitting means extending from an intermediate portion of saidpiston through said second lateral opening.

12. A device of the character described, including: a'body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being first and second lateral openingsextending respectively upwardly and downwardly from an intermediateportion of said cylinder bore to the exterior of said body, there beingports connecting the ends of said cylinder bore with said valve bore atpoints a short distance within the ends of said valve bore, and therebeing also a fluid discharge passage extending outwardly from anintermediate portion of said valve bore; a double-ended piston in saidcylinder bore, said piston being shorter than said cylinder bore so asto reciprocate therein; a valve stem extending longitudinally withinsaid valve bore; a valve head connected to each end of said valve stem,each of said heads being adapted to be moved between positions beyondand within the said port associated therewith while the other of saidheads is moved by said stem between positions within and beyond the saidport at the opposite end of said valve bore, so that when one of saidheads is in a position to connect an end of said cylinder bore with thecorresponding end of said valve bore, the other of said heads will be ina position to connect the opposite end of said cylinder bore through theintermediate portion of said valve bore with said fluid dischargepassage; a fly-wheel mounted on said body adjacent the outer end of saidfirst lateral opening, said fly-wheel having a crank and a valveoperating eccentric; a yoke member reciprocated by said eccentric; meansconnecting said yoke member with said valve stem so as to move saidvalve stem back and forth in accordance with the movement of saidpiston; a bar slidable on said body adjacent said first lateral opening;means connecting said bar with said piston through said first lateralopening; connecting rod means connecting said crank of said fly-wheelwith said bar, whereby the reciprocation of said bar by said piston willbe transmitted to said crank of said fly-wheel; a hollow cover memberover the top of said body; end plates extending vertically across theends of said body and said cover member, said end plates closing theends of said cylinder bore, said valve bore, and said fluid deliverypassage, and one of said end plates having a fluid passage thereinconnecting with said fluid delivery passage of said body; and powertransmitting means extending from an intermediate portion of said pistonthrough said second lateral opening.

13. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being a lateral opening from anintermediate portion of said cylinder bore to the exterior of said body,there being ports connecting the ends of said cylinder bore with saidvalve bore at points a short distance within the ends of said valvebore, and there being also a fluid discharge passage extending outwardlyfrom an intermediate portion of said valve bore; a double-ended pistonin said cylinder bore, said piston being shorter than said cylinder boreso as to reciprocate therein; a valve stem extending longitudinallywithin said valve bore; a valve head connected to each end of said valvestem, each of said heads being adapted to be moved between positionsbeyond and within the said port associated therewith while the other ofsaid heads is moved by said-stem between positions within and beyond thesaid port at the opposite end of said valve bore, so that when one ofsaid heads is in a position to connect an end of said cylinder bore withthe corresponding end of said valve bore, the other of said heads willbe in a position to connect the opposite end of said cylinder borethrough the intermediate portion of said valve bore with said fluiddischarge passage; valve operating means connecting with said valve stemso as to move the same back and forth in timed relation to the movementof said piston; actuating means for said valve operating meansconnecting through said lateral opening with an intermediate portion ofsaid piston; and a pair of end plates secured to the ends of said bodyso as to overlie the ends of said cylinder bore, said valve bore, andsaid fluid delivery passage, there being a fluid passage through one ofsaid end plates connecting with said fluid delivery passage of saidbody.

14. A device of the character described, including: a body having alongitudinal cylinder bore, a valve bore, and a fluid delivery passage,from end to end thereof, there being a lateral opening from anintermediate portion of said cylinder bore to the exterior of said body,there being ports connecting the ends of said cylinder bore with saidvalve bore at points a short distance within the ends of said valvebore, and there being also a fluid discharge passage extending outwardlyfrom an intermediate portion of said valve bore; a doubleended piston insaid cylinder bore, said piston being shorter than said cylinder bore soas to reciprocate therein; a valve stem extending longitudinally withinsaid valve bore; a valve head connected to each end of said valve stem,each of said heads being adapted to be moved between positions beyondand within the said port associated therewith while the other of saidheads is moved by said stem between positions within and beyond the saidport at the opposite end of said valve bore, so that when one of saidheads is in a position to connect an end of said cylinder bore with thecorresponding end of said valve bore, the other of said heads will be ina position to connect the opposite end of said cylinder bore through theintermediate portion of said valve bore with said fluid dischargepassage; valve operating means connecting with said valve stem so as tomove the same back and forth in timed relation to the movement of saidpiston; actuating means for said valve operating means connectingthrough said lateral opening with an intermediate portion of saidpiston; a cover extending from end to end of said body and over saidvalve operating means; and a pair of end plates secured to the ends ofsaid cover and said body so as to overlie the ends of saidcylinder bore,said valve bore, and said fluid delivery passage, there being a fluidpassage through one of said end plates connecting with said fluiddelivery passage of said body.

VERNON M. EVERETT.

